51131560257 has 32 divisors (see below), whose sum is σ = 78672038400. Its totient is φ = 32793704064.

The previous prime is 51131560253. The next prime is 51131560267. The reversal of 51131560257 is 75206513115.

It is a happy number.

51131560257 is a `hidden beast` number, since 5 + 11 + 31 + 5 + 602 + 5 + 7 = 666.

It is not a de Polignac number, because 51131560257 - 2² = 51131560253 is a prime.

It is a super-2 number, since 2×51131560257² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51131560253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198633 + ... + 376454.

It is an arithmetic number, because the mean of its divisors is an integer number (2458501200).

Almost surely, 2^51131560257 is an apocalyptic number.

It is an amenable number.

51131560257 is a deficient number, since it is larger than the sum of its proper divisors (27540478143).

51131560257 is a wasteful number, since it uses less digits than its factorization.

51131560257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575222 (or 575216 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The spelling of 51131560257 in words is "fifty-one billion, one hundred thirty-one million, five hundred sixty thousand, two hundred fifty-seven".